Cableway.



H. 0. ADAM.

GABLEWAY. APPLIOATION FILED JAN. 14, 1911.

1,003,083. Patentedsept. 12,1911

2 SHEETSFSHBET 1.

H. O. AEAM GABLEWAY.

APELIOATION FILED MN. 14, 1911.

Ememte X2, ESM.

2 BBEETE-SEEET 2.

' Fi g4.

.HEERE/IGH @TTG JDAM, F DRESDEN, GERMMY.

CABLEWAY.

I Speeioaton of Letters Patent.

Patented Sept. 12, 1911.

Application i'i'leil January le, 19in. Serial No. 602,705.

To all whom 'it may cof/leem;

Bel it known that l', HEINRICH O'r'ro ADAM, a citizen of the German Empire, residing at 37 Uhlandstrasse, Dresden, in the German Em ire, have invented certain new and useful improvements in Gahleways, oi which the following is a specification, refer ence being had therein to the accompanying drawings.

This invention relates to improvements in electrically actuated cableways such as are described in my prior specifications of Letters Patent oi? the United States Nos. 820464 and 9453509. According to the system described in these prior speciiications the motor consists of two rotary parts, one of which actuates the conveylng cable while the other is normally at rest and is put in motion only ifor the purpose of regulating the tension of the conveying cabie whenever the relative move ment of the points of support of the con- -veyng cable necessitates the 'tightening or 'slackening of the conveying cable. Whenboth parts of the motor rotate the energy supplied' by each will depend mainly on the relative speed of these two parts, and it is consequently obvious without further explanation that according to the speed of that part-of the motor which is normally at rest there exist an infinite number of states oi equilibrium ior'the motor system. Now it is most important that the tightening or slackening of the cable should be effected as "promptly as possible, that is to say2 it 1s necessary to select from the infinite number of states of equilibrium existing between the two' rotary parts of the motor that which enables the tension .of the cable to be adjusted in the least possible time. in the construction described in my specification of United States Letters Patent No.- 943509, l have attempted to attain this result by putting into `circuit with the motor referred to a compensating dynamo which is designed to iniiuence the ieldoi the motor. It has,

- however, been foundimpracticable by `this means to adjust the tension of the cable with suiiicient promptitud'e. y

Now this invention relates to' a novel arrangement o-r obviating the disadvantage just referred to, according to which the equilibrium of the electric system of the motor, consisting, for instance, of an armature and a casing both adapted to rotate and consequently preserving anl infinite number of states of equilibrium, is secured in such manner that the torque available for operating the tensioning device can be articially increased. By this means it becomes practicable to employ for the operation of the conveying cable proper, that is to say, for the forward movement when tightened up, aportion only of the motor torque, with the result that a temporary variation in the output of the driving motor exerts no influence on the actual motor torque. By this means the driving of the cable is rendered uniform with the result that the tightening and slaclrening of the conveying. cablecan be effected in the shortest possible time.

ln the accompanying drawings, which illustrate apparatus in accordance with this invention, Figure i shows in elevation, and F ig. 2 in plan a constructional form of said apparatus, while Fig. 3 illustrates a modification wherein ordinary motors are employed. Figs. 4 and 5 are diagrammatic representations of the wiring and circuits of the apparatus shown in Figs. l and-3 respectively. V

In the various figures the same reference letters indicate the same parts.

The manner in which the uniform ruuning of the motor system is brought about is immaterial with respect to the scope of the claims. The description relates to an eX- ample wherein the uniformity is attained by electrical means, use being made also oi:` mechanical effects.

n'contradistinction to other known construc-tions, in the construction to which this description relates, the magnetic system b is provided with an additional winding g around which a second magnetic system h is arranged. By thismeans, as distinguished from the arrangements in other motor systems, in which both motor parts could rotate freely, there is brought about, so to spealn a positive connection between the running parts.- The armature .winding g acting as a generator winding for instiuice,

winding drum e can be correspondingly reduced. When now the distance between the y points of support of the conveying cable is decreased, the magnetic system b will no longer be able as heretofore to increase its rate of rotation, as the ield-winding g within this magnetic system will at once exert a strong braking action and will transmit the superfluous energy to the circuit. When, on the contrary, the distance between the supporting points is increased, so that the winding drum c has to unwind the tightening rope 7, the reduction in the rate of rotation of the magnetic system b, whichy hitherto has always taken place, is effectivelyA prevented, as the amountof energy transferred from the armature winding g to the circuit decreases considerably, even when the change in the rate of rotation is practically a minimum, and may even fall to zero. Should a further small reduction in the rate of rotation of the magnetic system t and of the armature winding g arise, this winding will even take up energy from the circuit and running as a motor armature will aid the driving motor hitherto loaded by it, with t-he result that the latter practically retains its normal speed and the normal relative rate of rotation of the driving motor can now be kept as low as may be desired for the purpose of increasing the torque required for the tightening device.

As in some cases the energy required to keep the rate of rotation of the magnetic system Z) constant is relatively so small, and

as consequently the amount of energy taken from the circuit is not large, the armature winding g may be caused to Work on a` resistance in'stead of returning currentf'to the circuit. In this case uniformity is secured by means of braking by the windings g and 72.. This method of securing uniformity may -however be replaced by purely mechanical work, in such manner that the temporary increase or decrease of the braking action iseffectcd by hand or automatically for instance by the tension of the tightening rope or of the conveyer cable.

Fig. 4r shows Aclearly the circuits of the apparatus shown in Figs. l and 2 in connection with the -main line conductors ef.

Fig. 3 illustrates the method ot It ils coupled with the machine Gr H which, i as in the case of the machine g of Fig.I l,

renders uniform the driving of the cable. Both the machines B and G H may, under normal conditions, operate as motors, or Gr H may normally run idly leaving B to do all the work required. In any event, one of the machines eilects the positive driving of the conveying cable, the motor B, for instance, driving the cable while the machine G H acts as a generator when the speed of rotation is normal or excessive. `When the motors B and D are connected in seriesythe motor B will rotate while the mqytor `D Awill remain stationary, so long as the tension of the cable is normal and will maintain the tension by means of its torque. lVhen the supporting points of the conveying cable approach each other the motor D will begin to wind up the tightening rope. Obviously the `arrangement shown in Fig. 3 corresponds practically to that shown in Figs l and 2, the motor B corresponding to t-he magnetic system Z), the motor G H to the magnetic. system h, with the winding g, and the motor D to the armature d, and

also the object is exactly the same, namely,-

D which is connected up in series to the motor B. Whenever the tightening rope is wound up, the counter E. M. F. of the motor B will decrease as the result of the weakening of its field, for instance by the movement of the regulating resistance of the magnetic field, and consequently the energy available for effecting the running of the motor D will increase, so that it will quickly tighten up the slackened ropes. The machine G H, the field of which is influenced either not at all or oppositely, keeps the speed of-rotation ofthe conveying vcable. constant, by braking or driving it as may be required. The opposite procedure will occur should the tightening rope forcibly turn the winding drum of t-he motor D rearward when the tension of the conveying cable is too great. Fig. 5 shows clearly the circuits of the apparatus shown in Fig. 3 in connection with the main line conductors i.

ln apparatus of the class described, in combination, a conveying cable, a tensioning cable, 4'tension drum, said drum boing idle when the conveying cable is under normel tension, a motor, a rotary driving pulley actuated thereby and mean operativey connected to said motor for maintajnin the speed constant whereby the tension Vrum will adjust the tension of the conveying cable.

In testimony whereof I my slgnature Witnesses:

PAUL ARRAS, CLRE SmoN. 

